I am creating a dapp using web3-1.0. I have a contract that stores personal data for a particular user(account). I want to implement a functionality so that a user can share his data (stored in the ...

I'm trying to find an easy pattern to revert/rollback a write transaction.
The first idea was to log a GenericErrorEvent but then I noticed that it will never be emited if any require/revert/assert ...

After a long debugging I found that I had two following problems in a private ethereum network using geth:
If I have a require statement then the code is not executed on the EVM. The solution I found ...

I have a solidity function with only one statement i.e., require(). My logic is if that function throws error then the data is invalid otherwise valid. But that error is not caught in err parameter of ...

I'm experimenting a little bit with the blockchain, I'm currently trying to send from an oracle an address to store on the blockchain through a smart contract. The code (very simple and without checks)...

Web3js as of version 1.0.0 beta supports an interface for verifying signed messages: https://github.com/ethereum/web3.js/issues/404
This is documented here: https://web3js.readthedocs.io/en/1.0/web3-...

I am using web3.py but I need help to know the value of the transaction sent.
I know that the information is stored in the input but how do I parse the string. I know nothing about ABI.
Here is the ...

I'm having some issues sending out from metamask and getting failed transactions. I think maybe I should use another app on android if possible. What android wallet apps can import a Metamask private ...

I've been trying to send some BAT tokens out of my metamask wallet for quite awhile and it keeps eating up all my eth gas fees. I even increased the gwei fee to 100 and paid .50 USD as the fee. And it ...

How do I add extra content to the initial state of drizzle? I want to keep some local information that is not dependant on the blockchain. Should I keep a seperate redux store for that or is there a ...

I have tried this solution and it worked but only if I use privateKey of the wallet which I used to create custom tokens but what if I want to send from B wallet to C wallet and when I am trying it, ...

I'm quite new to Ethereum, so, pls, forgive me if I say something wrong.
How can I see the balance of one already existing address, for which I have the corresponding private key, in MyEthereumWallet?...

everyone! A few days ago, Etherscan has updated their user interface - and now I have no idea, how to get the verified contract's source. Before it was located no the #readContract tab, but now there'...

edit) VM execution error was a bug on Web3, confirmed my code works fine.
I am trying to fetch random addresses from blockchain and trying to categorize them if it is an ERC20 contract address or not....

I am trying to do smart contract migration in solidity 0.5 using the proxy delegate pattern. When I write the integration test in javascript how should i make a delegate call using the proxy contract ...

I am in the process of exposing a web interface to interact with a back-end Web3 Json Rpc compatible node, but it is necessary that I add additional parameters in the jsonrpc request before submitting ...

Hey is there a quick way to embed an Ethereum wallet address and a button into my existing website so as to allow people to send in their ETH donations to me?
Or do I need to go through the whole npm ...

I tried to install web3 in my mac by using sudo npm install web3 but failed many a times . Please help me to sort this matter out . i am attaching you the exact error that I am facing while running ...

I have set up drizzle to be able to connect to my smart contract from my react-application. After some fiddling, I decided to make this function in my smart contract:
/*** test ***/
uint numberFive = ...

I am currently dealing with a problem in Ethereum Blockchain. I wrote a smart contract in Solidity Language, about a site that someone can make his Registration and after the transaction is completed ...